GPS synchronized frequency/time source
First Claim
1. A system comprising:
- a GPS receiver that receives and produces as output signals GPS information;
a variable frequency oscillator having a frequency control input terminal and producing an output frequency signal coupled to the GPS receiver;
data processing means, coupled to receive the output signals produced by the GPS receiver, for producing an error signal indicative of a difference in frequency between a GPS synchronized frequency and the output frequency signal of the variable frequency oscillator; and
means responsive to said error signal for producing an electronic frequency control signal and for applying the electronic frequency control signal to said frequency control input as to cause said difference in frequency to be reduced.
1 Assignment
0 Petitions
Accused Products
Abstract
A GPS-based frequency/time source of the present invention provides an accurate, traceable low cost reference. In particular, the GPS-based frequency/time source includes a GPS receiver, a variable frequency oscillator and a micro processor. The GPS receiver receives and produces as output signals GPS information, whereas the variable frequency oscillator has a frequency control input terminal and produces an output frequency signal, and is coupled to the GPS receiver. The micro processor is coupled to receive the output signals produced by the GPS receiver and produces an error signal indicative of a difference in frequency between GPS synchronized frequency and the output frequency signal of the variable frequency oscillator. Circuitry is responsive to the error signal to produce an electronic frequency control signal, which is applied to the frequency control input of the variable frequency oscillator so as to cause the difference in frequency to be reduced. In this manner, a low cost oscillator may be employed in such a way as to produce a very accurate output frequency signal.
-
Citations
7 Claims
-
1. A system comprising:
-
a GPS receiver that receives and produces as output signals GPS information; a variable frequency oscillator having a frequency control input terminal and producing an output frequency signal coupled to the GPS receiver; data processing means, coupled to receive the output signals produced by the GPS receiver, for producing an error signal indicative of a difference in frequency between a GPS synchronized frequency and the output frequency signal of the variable frequency oscillator; and means responsive to said error signal for producing an electronic frequency control signal and for applying the electronic frequency control signal to said frequency control input as to cause said difference in frequency to be reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification